CVE-2023-32653
📋 TL;DR
This critical vulnerability in Accusoft ImageGear allows attackers to execute arbitrary code by tricking users into opening specially crafted malicious files. The out-of-bounds write in the dcm_pixel_data_decode function can lead to complete system compromise. Any system running vulnerable versions of ImageGear that processes untrusted DICOM or other supported image files is affected.
💻 Affected Systems
- Accusoft ImageGear
📦 What is this software?
Imagegear by Accusoft
⚠️ Risk & Real-World Impact
Worst Case
Complete system takeover with attacker gaining full control of the affected system, potentially leading to data theft, ransomware deployment, or lateral movement within the network.
Likely Case
Remote code execution with the privileges of the user opening the malicious file, enabling data exfiltration, malware installation, or system disruption.
If Mitigated
Limited impact through application sandboxing, file type restrictions, or privilege separation that prevents full system compromise.
🎯 Exploit Status
Exploitation requires user interaction to open a malicious file, but the vulnerability itself is straightforward to exploit once a malicious file is crafted.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 20.2 or later
Vendor Advisory: https://www.accusoft.com/products/imagegear/
Restart Required: Yes
Instructions:
1. Download ImageGear version 20.2 or later from Accusoft. 2. Uninstall current vulnerable version. 3. Install the patched version. 4. Restart any applications using ImageGear.
🔧 Temporary Workarounds
Restrict file processing
allConfigure applications to only process image files from trusted sources and implement file type validation.
Application sandboxing
allRun applications using ImageGear with reduced privileges or in sandboxed environments.
🧯 If You Can't Patch
- Implement strict file upload validation and scanning for all image files before processing.
- Use application allowlisting to prevent execution of unauthorized applications that might use vulnerable ImageGear components.
🔍 How to Verify
Check if Vulnerable:
Check the ImageGear version in use by applications. Versions 20.1 and earlier are vulnerable.Check Version:
Check application documentation or contact vendor for version verification method specific to your implementation.Verify Fix Applied:
Verify that ImageGear version is 20.2 or later and test with known safe DICOM files to ensure functionality.📡 Detection & Monitoring
Log Indicators:
- Application crashes when processing image files
- Unexpected process creation from image processing applications
- Memory access violation errors in application logs
Network Indicators:
- Unusual outbound connections from systems running ImageGear after file processing
- File downloads from untrusted sources followed by application execution
SIEM Query:
ImageGear AND (crash OR memory violation OR out-of-bounds) OR process creation from image viewer applications